Method of forming brake shoes and blanks therefor



March 7, 1933. 5 WHITWQRTH 1,900,004

METHOD OF FORMING BRAKE SHOES AND BLANKS THEREFOR Filed Dec. 15, 1927 2 Sheets-Sheet 1' FlsJ A A A 7 I\ I I I! III I I I I I INVENTOR STANI EY WHITWORTH .IJT

ATTORNEY METHOD OF FORMING BRAKE SHOES AND BLANKS THEREFOR Filed Dec. 15, 1927 2 Sheets-Sheet 2 W i I746 v g I i I i J ';//2 .l i f I l i i I i l -JN INVENTOR gay/fail? ATTORN EY STABIIBIFEY WHITWORTH Patented Mar. 7, 1933 UN TED STATES PATENT OFFICE STANLEY wm'rw'o rm-or SOUTH BEND, INDIANA, ASSIGNOR To BENDIX BRAKE coil:-

' PANY, or SOUTH BEND,INDI.A1\TA, A CORPORATION or ILLINOIS 453 of-theshoe.

' METHOD or FORMING BRAKE SHOES AND BLANKS THEREFOR Application filed. December 15, 1927. Serial No. 240,175.

This invention relates to brake shoes, and isdescribed in connection withthe manufacture of a novel shoe folded from a flat sheetmetal blank, and adapted for use in an internal expanding automobile brake. An object of the invention is extremely strong shoe, or the. like, preferably by folding it from flat sheet steel in a novel manner, giving it What may be regarded asa laminated structure.

In the arrangement illustrated, the shoe is folded or pressed from a novel blank having, at one or both sides, series of tongues, preferably trapezoidal in form. In the best ari rangement the tongues of one series are staggered with respect to those of the other series, and in folding the blankto form a shoethe joints between the tongues of each series are bridged and connected by the tongues of the- Z other series, although in the broader aspects of the invention these joints may be bridged by other means connecting the tongues. The, centerof the blank, which is generally rectangular in form, constitutes the friction face i of thefinishedshoe, and is ordinarily formed onv a cylindrical arc. In order to fasten together to form a double-thickness stiffening webfo'r the shoe, it is usually best to fold por- T tions of the blank underthe opposite sides of the central position so that the cylindrical part of the finished shoe is also of double thickness. scribed above, prior to bending it to form it i on the desired arc. o I

The blank may, if desired, be formed with one or more portions, which may for example be vextensions of tongues at the end of the shoe, and which project beyond the end of the generally-rectangular centralportion of the blank, andwhich form pivot or anchor arms in thefinished shoe, and also with an integral extension whichforms in the finished shoe a thrust part or cam plate" extending crosswise to form a lightbut the two series of tongues Iprefe r to fold the blank as de- The above and other objects and features of the invention, including various novel and desirable details, will be apparent from the following description of the constructionof I the shoe illustrated in the accompanying drawings, in which: Figure 1 a plan view of one form of blank for the shoe; T

Figure 2 is a side elevation of the blank after it is formed into a T shape in crosssection; v

Figure 3 is a side elevation of the shoe,

after it finished except for the attachment of the lining, etc.;

i Figure 4 is a section through the shoe on the line H of Figure 3; v

Figure =5 is an inside elevation of part of the shoe, lookingin the direction of the ar- I ()WSI5,-5 in. Figure 3;

. Figure 6 is a top plan view of the end of the shoe, looking in the direction of the row-s 6-6 in Figure 3;.and v i Figure 7 is a view corresponding to Figure 6, but showing a modified construction.

The novel blank fromwhichthe shoe is formed is shown in plan in Figure 1. It includes a generally-rectangular central portion 10, which forms the friction face of the finished shoe, preferably also one or apair of generally-rectangular side portions 12 and 14, and series of tongues 16 which are preferably generally trapezoidal in form,- i. e. the sides of the openings 18' between the tongues diverge outwardly. I consider it highly desirable'that the tongues of the two ser'ies should'be staggered with respect to which forms a thrust part or cam plate in the finished shoe.

The blank is first folded into a straight member, such as shown in Figure 2, which 5 is T-shaped in cross-section as shown in Figure 4;. This may be done all in one folding operation, or the tongues 16 may be folded 90 in one direction about the dotted lines 24, after which the side portions 12 and 14 are folded 180 in the opposite direction substantially edge to edge.

two series are staggered with respect to each other. While held in this cylindrical form, the two series of tongues are permanently secured together, for example by pro ectionwelding or by ordinary spot-weldlng, thus forming a double-thickness stiffening web for the shoe. An opening 28 may be punched in the pivot arm 20, to receive a bushing or be otherwise formed and arranged to be mounted on a pivot or anchor, and an opening 30 may also if desired be formed to provide clearance for the pivot or anchor of an adjacent shoe.

The tongue, 22, if provided, is folded across the end of the stiffening web, as shown in "Figure 6, to provide a thrust member for engagement with a cam or other applying device. Another arrangement for this purpose is shown in Figure 7 where the two end tongues 16 diverge from each other to provide a trussed support for a tongue 122 bent crosswise of the shoe. The tongue 122 may, if desired, be arc-welded at its end to the opposite tongue 16.

The shoe made as described above, completed except for the pivot or anchor bushing ordinarily used in the openlng 28 and except for the friction lining (shown however in dotted lines at 32 in Figure 4), is

shown in Figures 37.

WVhile one illustrative embodiment hasbeen described in detail, it is not my intention to limit the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

The subject matter herein disclosed and not claimed forms the basis for my copending divisional application Serial No. 603,866 filed April 7 1932.

I claim 1. Ablank for forming a brake shoe, having a substantially rectangular portion adapted to form the friction face of the shoe and which is integrally connected along at least one side edge with a second rectangular portion which is half as wide as the first portion, and which has along its opposite edge a series of tongues adapted to form a stiffening web for the finished shoe, and which has integrally connected therewith in line with said series oftongues a part projecting beyond the end of the rectangular portion and forming a projecting arm in the finished shoe.

2. A blank for forming a brake shoe, having asubstantially rectangular portion which has at least along one edge a series of tongues adapted to form a stiffening web for the finished shoe, and which has integrally connected therewith in line with said series of tongues a part projecting beyond the end of the rectangular portion and forming a. projecting arm in the finished shoe.

3. A blank for forming a brake shoe, having a substantially rectangular portion which has along its opposite side edges two series'of' tongues adapted to form stiffening means for the finished shoe, and which has integrally connected therewith inline with said two series of tongues, respectively, two parts projecting beyond the end of the rectangular portion. i

4;. A blank for forming a brake shoe, having a substantially rectangular portion which has at least along one edge a series of tongues adapted to form a stifiening web for the finished shoe, and which also has a projecting integral part at one end, adapted to be folded crosswise of the shoe to form a thrust,

member.

5. A blank for forminga brake shoe, having a substantially rectangular portion for forming the cylindrical part of the shoe, and with portions extending outwardly from its opposite sides and adapted to form stiffening means for the finished shoe, and with portions projecting integrally beyond one end of the rectangular portion in line with the outwardly-extending portions and forming projecting arms in the finished shoe.

6. A blank for forming a brake shoe, hav ing a substantially rectangular portion for forming the cylindrical part of the shoe, and with a portion extending outwardly from at least one of its sides andv adapted to form stiffening means for the finished shoe, and with a portion projecting integrally beyond one end of the rectangular portion in line with the outwardly-extending portion and forming a projecting arm in the finished shoe.

7. A blank for making a brake shoe having along its opposite side edges two series of generally trapezoidal tongues, the tongues of one series being opposite the openings between the tongues of the other series.

8. That method of forming a brake shoe which comprises forming a blank with trapement to form stifliening means.

10. That method of forming a brake shoe which comprises forming a blank with two series of trapezoidal tongues along its opposite sides and which are staggered with respect to each other, bending the tongues normal to the blank and bending the blank in an arc to bring the tongues of each series into edge-to-edge abutting engagement and securing the two series of tongues together with the several tongues bridging the joints between the successive tongues of the other series.

11. That method of forming a brake shoe which comprises forming a blank with two series of tongues along its opposite sides and which are staggered with respect to each other, bending the tongues normal to the blank and bending the blank in an arc and securing the two series of tongues together with the several tongues bridging the joints between the successive tongues of the other series.

12. That method of forming a brake shoe which comprises forming a blank with two series of tongues along its opposite sides and which are staggered with respect to each other, bending the tongues at right angles to the blank bending the blank in an arc and securing the two series together with the joint between each two successive tongues oione series being bridged by one of the tongues of the other series.

13. That method which comprises forming a blank with two series of tongues along its opposite sides and which are staggered with respect to each other, bending the tongues at 1 right angles to the blank bending the blank in an arc and securing the two series together with the joint between each two successive tongues of one series being bridged by one 6 of the tongues of the other series 14. That method which comprises forming a blank with two series of tongues along its opposite sides and which are staggered with respect to eachother, bending the tongues at right angles to the blank and bending the entire blank in an arc and securing the two series together with the joint between each two successive tongues of one series being bridged by one of the tongues of series.

the other 15. That method which comprises forming a blank with two series of trapezoidal tongues along its opposite sides and which are sta ered with res set to each other iold- 25b 7 ing the blank to bring the tongues at right angles to the remainder of the blank and with the two series of tongues in engagement with each other, the space between each two successive tongues of the one series being bridged by one of the tongues of theother series, and then bending the blank on an arc and securing the two series of tongues together to form a double-thickness stiffening web.

16. That method which comprises forming a blank with a central rectangular portion and with two rectangular portions of half the width along opposite sides of the central portion and with two series oftongues along the sides of the said two portions folding the said two portions under opposite sides of the central portion and folding the tongues at right angles to the doublethickness part so formed, the tongues forming a laminated stiffening means for the double-thickness part.

17 That method which comprises forming a blank with a central rectangular portion and with two rectangular portions of half the width along opposite sides of the central portion and with two series of tongues along the sides of the said. two portions, folding the said two portions under opposite sides of the central portion and folding the tongues at right angles to the double-thickness part so formed, the tongues forming a laminated stiiiening means for the doublethickness part, and bending the entire blank on an arc, the tongues being trapezoidal in form so that the bending brings them togetgier to form a substantally continuous we '18. That method which comprises forming a blank with a central rectangular portion and with two rectangular portions of half the width along opposite sides of the central portion and with two series oi tongues along the sides of the said two portions, folding the said two portions under opposite sides of the central portion and folding the tongues at right angles to the double-thickness part so formed, the tongues forming stiffening means for the double-thickness part, and bendingthe entire blank on an arc,

the tongues being trapezoidal in form and t the tongues of one series being staggered with respect to those of the other series so that the bending brings them together to a blank with a rectangular'portion and with a rectangular portion of half the width along at least one side and With a, series of tongues along the side of the said half-Width portion and folding the said half-Width portion under the side of the first portion and folding the tongues at right angles to the doublethickness part so formed, the tongues forming a laminated stiffening means for the double-thickness part.

In testimony whereof, I have hereunto signed my name.

STANLEY WHITWORTH.

CERTIFICATE OF CORRECTION.

Patent No. 1,900,004. March 7, 1933.

STANLEY WHITWORTH.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 14, claim 9, after "form" insert "a laminated"; and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of August, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents. 

